First of all, the houses to be demolished include dangerous houses, that is, dangerous houses. These houses may be at risk of collapse because of their long service life and various materials reaching a certain service life, or they are too inclined to live, and these houses must be repaired, even if there are still risks after repair, they will be defined as dangerous buildings. Then, in addition to dangerous buildings, even the houses planned by urban construction will be forcibly demolished, or some residents' residential buildings will also be demolished. This is what everyone wants to see very much, because the city may have to build railways, roads and various public facilities in the planning process. If some houses are planned, they may be demolished after negotiation. In addition, if the country wants to demolish some old houses with good lots, such as building some houses and train tracks, it may need to buy houses in some areas with good lots and then demolish them. Unless they are houses with historical value and significance, such as places of interest, they may face demolition. Some houses that may be demolished are old houses, that is, houses that have been used for a long time or have been useless for a long time will definitely be demolished. Because the value of these houses after demolition will be much higher than before, and it will be better after demolition.